You just treat scientific notation as a math problem. For example, 1.17*10^5 would be 1,17,000 (or in layman's terms, move the decimal point the number of spaces indicated by the exponent). If there's a negative exponent, that means you move the decimal to the left instead of to the right. For example, 1.17*10^-5 would be 0.0000117.
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one thousand three hundred sixteen ten- thousandths
Just remember that there is one digit to the left of the decimal in scientific notation. All the other digits go on the right of the decimal. Then find an appropriate power of ten to write the rest of the number. Your 2042 is 3.76 x 105 in scientific notation.
1321000 in scientific notation is 1.321 x 10^6
To write 873000 in scientific notation, we need to move the decimal point to the left until there is only one non-zero digit to the left of the decimal point. This would be 8.73 x 10^5 in scientific notation.
Just remember that there is one digit to the left of the decimal in scientific notation. All the other digits go on the right of the decimal. Then find an appropriate power of ten to write the rest of the number. Your 3,400 in scientific notation is 3.4 x 104in scientific notation.